Color appearances do not satisfactorily match between recording paper sheets with different gloss characters even using a colorimetric matching process. Hence, the differences between the gloss characters of the recording paper sheets are obtained as correction amounts, and a media profile indicating correspondence between color signals of an image forming apparatus and calorimetric signals corresponding to recording paper is corrected on the basis of the obtained correction amounts.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A color processing method of correcting a profile which holds correspondence between colorimetric data and color data of a device and corresponds to one of recording media, comprising the steps of: obtaining colorimetric data of a first black patch formed on a target recording medium using a profile corresponding to the target recording medium; obtaining colorimetric data of a second black patch formed on a subject recording medium using a profile corresponding to the subject recording medium in case that a user determines that color appearances of the first and second black patches are color-matched by visual observation, wherein glossiness of the subject recording medium is different from glossiness of the target recording medium; calculating a correction amount based on the obtained colorimetric data of the first and second black patches; and correcting colorimetric data in the profile corresponding to the subject recording medium using the calculated correction amount.
2. The method according to claim 1 , wherein the correcting step is not executed when a color difference between the colorimetric data of the first and second black patches is smaller than a predetermined value, and the correcting step is executed when the color difference is equal to or larger than the predetermined value.
3. A computer-readable storage medium storing a computer-executable program for causing a computer to perform a color processing method of correcting a profile which holds correspondence between colorimetric data and color data of a device and corresponds to one of recording media, the method comprising the steps of: obtaining colorimetric data of a first black patch formed on a target recording medium using a profile corresponding to the target recording medium; obtaining colorimetric data of a second black patch formed on a subject recording medium using a profile corresponding to the subject recording medium in case that a user determines that color appearances of the first and second black patches are color-matched by visual observation, wherein glossiness of the subject recording medium is different from glossiness of the target recording medium; calculating a correction amount based on the obtained colorimetric data of the first and second black patches; and correcting colorimetric data in the profile corresponding to the subject recording medium using the calculated collection amount.
4. A color processing apparatus for correcting a profile which holds correspondence between colorimetric data and color data of a device and corresponds to one of recording media, said apparatus comprising: a first obtaining section, arranged to obtain colorimetric data of a first black patch formed on a target recording medium using a profile corresponding to the target recording medium; a second obtaining section, arranged to obtain colorimetric data of a second black patch formed on a subject recording medium using a profile corresponding to the subject recording medium in case that a user determines that color appearances the first and second black patches are color-matched by visual observation, wherein glossiness of the subject recording medium is different from glossiness of the target recording medium; a calculator, arranged to calculate a correction amount based on the obtained colorimetric data of the first and second black patches; and a corrector, arranged to correct colorimetric data in the profile corresponding to the subject recording medium using the calculated correction amount.
5. The apparatus according to claim 4 , wherein the colorimetric data and the correction amount are tristimulus values.
6. The apparatus according to claim 4 , further comprising an acquisition section arranged to acquire chromaticity of illumination light, wherein said calculator calculates the correction amount from a difference value between luminance data of the colorimetric data of the first and second black patches, and the chromaticity of the illumination light.
7. The apparatus according to claim 4 , wherein lightness of the second black patch is lower than lightness of the first black patch.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
March 2, 2005
September 7, 2010
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